Abstract
Changes in morphology during growth in small specimens of Onithochiton neglectus Rochebrune, 1881 are described. Juvenile specimens of Onithochiton neglectus have tricuspid second lateral teeth, an anterior mucro, an abbreviated gill-line (which does not extend anteriorly to the head), scale-like elements on the dorsal surface of the girdle, and a tegmentum which either lacks or possesses only a few, relatively large, ocelli. The taxonomic significance of these observations is discussed, with special reference to the status of Onithochiton marmoratus Wissel, 1904, Icoplax chathamensis Dell, 1960, and the subgenus Anthochiton (Nodiplax) Beu, 1967.

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